JPS5838890B2 - Method for forming a full-tensile steel stranded overhead power transmission line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is a type of AC8 in which tension is applied only to steel stranded wires.
The present invention relates to a method of forming an R-type overhead power transmission line.

As is well known, the general AC8R type overhead power transmission line, which is made by closely twisting and integrating an aluminum stranded wire layer on a steel stranded wire, has a wire tension that is higher than that of the steel stranded wire and the layer on top of it. Because it acts on both of the aluminum stranded wire layers that are connected, the equivalent elastic modulus and equivalent linear expansion coefficient of the wire as a whole show the values as a composite stranded wire of both wires, so not only does the wire have a large sag when suspended, There are large fluctuations in sag due to load changes due to ice and snow accumulation, wind pressure, etc., and temperature changes, and therefore, the distance between phases or lines must be large, and the steel tower must be made considerably large.
Since the size of the entire power transmission line cannot be avoided, there are problems such as an enormous economic burden associated with the construction work.

These problems arise due to the tension acting on both the steel stranded wire and the aluminum stranded wire layer that is twisted and bonded thereon, as described above, so recently, efforts have been made to solve these problems. As a type of overhead power transmission line in which the tension of the electric wire is applied only to the steel stranded wires, and no tension is applied to the aluminum stranded wire layer, for example, aluminum is applied to the outside of the steel stranded wires as disclosed in Japanese Utility Model Application Publication No. 50-21683. □So-called loose-type overhead power transmission lines have been developed in which a stranded wire layer is loosely covered over the entire length and the two are mechanically separated.

However, in the case of loose overhead power transmission lines as mentioned above, aluminum is placed on the outside of the steel strands in order to mechanically separate the outer aluminum stranded wire layer from the steel strands located in the center. It is necessary to loosely twist the stranded wire layers into a cylindrical shape with gaps, but in this case, the work of loosely twisting the aluminum stranded wire layers itself is extremely difficult.
Therefore, there has been a problem with great difficulties in terms of manufacturing technology in order to obtain the desired product.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for forming a full-tensile steel stranded overhead power transmission line that advantageously solves the aforementioned problems.

Next, the present invention will be explained in detail using illustrated examples.

Figures 1 to 4 show an example of forming a full-tensile steel stranded wire shared type overhead power transmission line by implementing the present invention, in which a steel stranded cable is formed by twisting a plurality of steel cables together. An ordinary A wire in which an aluminum stranded wire layer 2 consisting of an aggregate of a plurality of aluminum wires is closely twisted and bonded to the outside of the wire 1.
In the C8R type overhead power transmission line 3, first, a plurality of metal compression sleeves 401, 402, 403...
Insert and install...

Next, the plurality of compression sleeves 401, 402, 403,
The two sleeves 401 and 402 located at both ends of ...... are first crimped onto the power transmission line 3 using a compressor or the like, and then these two crimped sleeves 401 and 402 are The sleeves 403 located in the middle of the two are crimped, and the sleeves 401 and 402 are located at both ends, and the sleeves 403 are located in the middle. Sleeves 404 and 405 of The work of crimping the sleeves onto the power transmission line 3 is completed.

Sleeve 401゜402.40 to such power transmission line 3
3 Each time the compression work is performed, plastic deformation and elongation is applied to each aluminum wire constituting the aluminum stranded wire layer 2 near the sleeve crimping part so that it escapes in the linear direction. In this way, as if a laughing phenomenon had occurred in the aluminum stranded wire layer 2, a button was pressed between each sleeve to make the aluminum stranded wire layer 2 rise above the steel stranded wire 1, creating a gap 5 between them. Let it form.

According to the present invention, each metal is fitted on the outer periphery of an ordinary AC8R type overhead power transmission line 3, which is formed by closely twisting an aluminum stranded wire layer 2 on the outside of a steel stranded wire 1, at appropriate intervals in the length direction. By compressing the sleeves 401, 402, 403... Since the gap 5 is formed between the stranded wire layers 2, the steel strands can be coated without any difficulties in manufacturing technology, such as when the aluminum stranded wire layer is loosely twisted and coated on the steel strands from the beginning. The wire 1 and the aluminum stranded wire layer 2 can be mechanically separated, and in particular, the compression work order of each sleeve installed on the power transmission line is as follows: First, the sleeves 401 and 402 located at both ends on the power transmission line 3 are compressed. Then, the sleeves 403, 404, 405, etc. are placed in the middle of the crimped sleeves and are spaced approximately equidistant from each other, and each sleeve is crimped onto the power transmission line 3 in turn. As a result, the plastic deformation and elongation of the aluminum stranded wire layer 2 caused by the compression work is not concentrated at local points in the length direction of the power transmission line 3, and in other words, the elongation is applied to the aluminum stranded wire between each adjacent sleeve. This is a full-tensile steel stranded overhead power transmission line with a structure in which the aluminum stranded wire layer 2 is evenly raised above the steel stranded wire 1 over the entire length of the transmission line 3 because the aluminum stranded wire layer 2 is distributed almost evenly in the layer portions. can be easily formed.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway side view showing a state in which a plurality of sleeves are crimped to the outer periphery of a power transmission line at appropriate intervals in the length direction, and FIG. is the first
FIG. 3 is a sectional view taken along the line B--B in FIG. 2, and FIG. 4 is a sectional view taken along the line C--C in FIG. 2. In the figure, 1 is a steel stranded wire, 2 is an aluminum stranded wire layer, 3 is an overhead power transmission line, 401, 402, 403, . . . are metal sleeves, and 5 is a gap.

Claims (1)

[Claims] 1 A plurality of metal sleeves 4 are installed on the outer periphery of the AC8R type overhead power transmission line 3 at appropriate intervals in the length direction, in which the aluminum stranded wire layer 2 is tightly twisted and integrated on the outside of the steel stranded wire 1.
01, 402, 403, etc., and then the above-mentioned plurality of metal sleeves 401, 402, 403.
. . . Two sleeves 401 and 402 located at both ends are first crimped onto the power transmission line 3,
Subsequently, the sleeve 403 located at the middle part of the two crimped sleeves 401 and 402, which is separated from the two sleeves 401 and 402, is crimped onto the power transmission line 3, and then the sleeve 403 located at the middle part between the sleeves 401 and 402 located at both ends is further crimped. Two left and right sleeves 404 and 405 located in the middle and approximately equidistant apart from the sleeve 403 located at ,407゜408・・・・・・・・・
・A method for forming a full-tensile steel stranded wire-shared overhead power transmission line, which is characterized by crimping these on the power transmission line 3 in the following order.